TY - JOUR A1 - Vömel, H. A1 - Diaz, K. T1 - Ozone sonde cell current measurements and implications for observations of near-zero ozone concentrations in the tropical upper troposphere JO - Atmos. Meas. Tech. Discuss. J1 - AMTD VL - 2 IS - 6 SP - 3153 EP - 3181 Y1 - 2009/12/08 PB - Copernicus Publications SN - 1867-8610 UR - http://www.atmos-meas-tech-discuss.net/2/3153/2009/ L1 - http://www.atmos-meas-tech-discuss.net/2/3153/2009/amtd-2-3153-2009.pdf DO - 10.5194/amtd-2-3153-2009 ER -